Toshiba 20A3VX Service Manual page 11

ITEM
WHITE BALANCE
ADJUSTMENT
•
CUTOFF ADJUSTMENT
(RCUT)
(GCUT)
(BCUT)
•
DRIVE ADJUSTMENT
(GDRV)
(BDRV)
NOTE: It is released built-in test pattern by changing the adjustment item for some model.
In this case, select the adjustment item with channel s t buttons first and then select the built-in test pattern with
-/- - button.
ADJUSTMENT PROCEDURE
1. Set Contrast to 40, and brightness to +20 by picture control.
2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO
button.
3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual
values to Initial reference data, and to set GDRV and BDRV to Initial reference
data with VOLUME ; – /+ buttons (See page 16).
4. Press -/- - button on the remote control and rotate Screen VR to get one slight
horizontal line on screen.
Note: Every pressing of -/- - button provides Horizontal line picture and Normal
picture alternately.
5. Press -/- - button to release horizontal line picture, and select the two other
colours which did not light in the above step with CHANNEL s, t buttons. Then
tap VOLUME ; – /+ buttons so that three colours slightly light in the same level.
X To correct white balance in light area,
select GDRV and BDRV with CHANNEL
s, t buttons to adjust.
X To correct white balance in dark area,
perform fine adjustment of RCUT, GCUT
and BCUT.
– 11 –
Light area check
(to show white)
Dark area check
(to show black)